Hydrogenation of carbon monoxide over vanadium oxide-promoted rhodium catalysts

Abstract

The effect of vanadium oxide as support and promoter on supported rhodium catalysts on the CO hydrogenation has been investigated at 0.15 and 4.0 MPa.

Manganese-promoted Rh/Al2O3 for C2-oxygenates synthesis from syngas

“…The literature contains some references to the influence of the promoter loading of elements such as Fe, Zr, V, La, etc. over rhodium-based catalysts [8,[21][22][23][24]. However, to our knowledge no detailed study of the effect of manganese oxide loading on Rh/Al 2 O 3 catalysts for oxygenate formation from syngas has been reported.…”

“…The addition of appropriate promoters can enhance the rate of formation of these oxygenates, especially in the case of ethanol. Many elements have been tested as promoters over rhodium-based catalysts, including compounds of alkali [4], rare earths [5,6], and transition elements [7,8]. The most extensively studied is manganese, which has been reported to increase catalytic activity and, in some cases, selectivity toward C 2 -oxygenates [9][10][11].…”

A Novel Concept for the Mechanism of Higher Oxygenate Formation from Synthesis Gas over MnO-Promoted Rhodium Catalysts

“…Higher oxygenates are oxygen-containing molecules with two or more carbon atoms, such as alcohols, aldehydes, and carboxylic acids. Promoters known to enhance the formation of higher oxygenates from syngas when added to Rh include compounds of alkali (3,4), rare earth (5,6), and transition elements (7)(8)(9).…”

The Influence of a Second Metal on the Ni/SiC Catalyst for the Methanation of Syngas

“…It has been reported that the addition of La and Ce could form a new kind of active sites and promote the dissociation of carbon monoxide [19][20][21][22]. Some researchers found that the addition of Zr, V, Mo, W and Re had positive effect for the dissociation of CO and could enhance the formation of intermediate species on the catalyst surface [23][24][25][26]. Co, Cu and Zn were also widely investigated as promoters in the hydrogenation of carbon oxides.…”